/Engine/Source/Editor/GraphEditor/Public/ConnectionDrawingPolicy.h
Util to make a 'distance->alpha' table and also return spline length
static float MakeSplineReparamTable ( const FVector2D & P0, const FVector2D & P0Tangent, const FVector2D & P1, const FVector2D & P1Tangent, [FInterpCurve](API\Runtime\Core\Math\FInterpCurve)< float > & OutReparamTable )